20721-08-8Relevant academic research and scientific papers
Design, synthesis, characterization and antimicrobial evaluation of some heterocyclic condensed systems with bridgehead nitrogen from thiazolotriazole class
Barbuceanu, Stefania-Felicia,Draghici, Constantin,Barbuceanu, Florica,Bancescu, Gabriela,Saramet, Gabriel
, p. 694 - 700 (2015/11/27)
In the present study, a series of new heterocyclic condensed systems with bridgehead nitrogen from the thiazolo[3,2-b][1,2,4]triazoles class was synthesized starting from some 4-(4-X-phenylsulfonyl)phenyl)-4H-1,2,4-triazole-3-thioles 1a-c (X=H, Cl, Br). The intermediates of S-alkylated 1,2,4-triazoles, 2-(5-(4-(4-X-phenylsulfonyl)phenyl)-2H-1,2,4-triazol-3-ylthio)-1-(4-fluorophenyl)ethanones 2a-c, were obtained by treatment of triazoles 1a-c with 2-bromo-4'-fluoroacetophenone. The 2-(4-(4-X-phenylsulfonyl)phenyl)-6-(4-fluorophenyl)thiazolo[3,2-b][1,2,4]triazoles 3a-c were obtained by cyclization of S-alkylated 1,2,4-triazoles 2a-c in sulfuric acid media, at 0°C. For the synthesis of 2-(4-(4-X-phenylsulfonyl)phenyl)-5-(4-fluorobenzylidene)-thiazolo[3,2-b][1,2,4]triazol-6(5H)-ones 4a-c, the triazoles 1a-c were treated with 4-fluorobenzaldehyde, chloroacetic acid and anhydrous sodium acetate, in the presence of acetic acid and acetic anhydride. The structures of the newly synthesized compounds have been confirmed by elemental analysis and spectral methods (IR, 1H-NMR,13C-NMR, MS). The antimicrobial activity of all new compounds has been screened against some bacteria and yeasts.
New Cu(II), Co(II), Ni(II) complexes with aroyl-hydrazone based ligand. Synthesis, spectroscopic characterization and in vitro antibacterial evaluation
Angelusiu, Madalina Veronica,Barbuceanu, Stefania-Felicia,Draghici, Constantin,Almajan, Gabriela Laura
body text, p. 2055 - 2062 (2010/07/06)
A new aroyl-hydrazone, N-(2-pyridinecarbaldehyde)-N′-[4-(4-chloro-phenylsulfonyl) benzoyl]-hydrazone (L) and its Cu(II), Co(II) and Ni(II) complexes have been prepared. The structure of these compounds has been investigated by using elemental analysis, magnetic susceptibility, molar conductance, thermal and spectral (IR, UV, NMR, LC-MS, EPR) measurements. The semi-empirical method MM2, LC-ESI-MS, NMR and IR spectra indicate that the ligand behaves as mononegative bidentate/tridentate with NO/NON donor sequence in E isomeric form towards the metal ions. The magnetic and spectral data indicate a square-planar geometry for Ni2+ complex and an octahedral or pseudo-tetrahedral geometry for Co2+ and Cu2+ complexes. Bacterial activity of acyl-hydrazone (L) and its complexes were studied against gram-positive bacteria: Staphylococcus aureus, Bacillus subtilis and gram-negative bacteria: Pseudomonas aeruginosa, Escherichia coli by using minimum inhibitory concentrations (MICs) method.
Copper(II) and uranyl(II) complexes with acylthiosemicarbazide: Synthesis, characterization, antibacterial activity and effects on the growth of promyelocytic leukemia cells HL-60
Angelusiu, Madalina Veronica,Almajan, Gabriela Laura,Rosu, Tudor,Negoiu, Maria,Almajan, Eva-Ruxandra,Roy, Jenny
scheme or table, p. 3323 - 3329 (2009/12/01)
New chelates of N1-[4-(4-X-phenylsulfonyl)benzoyl]-N4-butyl-thiosemicarbazide (X = H, Cl, Br) with Cu2+ and UO22+ have been prepared and characterized by analytical and physico-chemical techniques such as magnetic susceptibility measurements, elemental and thermal analyses, electronic, ESR and IR spectral studies. Room temperature ESR spectra of Cu(II) complexes yield {g} values characteristic of distorted octahedral and pseudo-tetrahedral geometry. Infrared spectra indicate that complexes contain six-coordinate uranium atom with the ligand atoms arranged in an equatorial plane around the linear uranyl group. Effects of these complexes on the growth of human promyelocytic leukemia cells HL-60 and their antibacterial activity (against Staphylococcus epidermidis ATCC 14990, Bacillus subtilis ATCC 6633, Bacillus cereus ATCC 14579, Pseudomonas aeruginosa ATCC 9027 and Escherichia coli ATCC 11775 strains) were studied comparatively with that of free ligands.
Flow-vacuum pyrolysis of polycyclic compounds. 251. Pyrolysis of some 3-mercapto-5-substituted-1,2,4-triazoles
Istrati, Daniela,Popescu, Angela,Mihaiescu, Dan,Saramet, Ioana,Bala?u, Mihaela C.
scheme or table, p. 497 - 503 (2009/05/11)
The flow-vacuum pyrolysis (FVP) of the 3-mercapto-5-substituted-1,2,4- triazoles 5a-c, between 475°C - 750°C, at 2 mm Hg, in inert atmosphere (4mL/min argon flow rate) and quartz pyrolysis tube (60 cm length, 1 cm internal diameter, quartz chips filling 30 mm long) afforded a complex mixture with cyano-diphenyl-sulphones 12a-c and corresponding diphenylsulphones 13a-c as main products. The reaction products were identified by GC/MS. A radical mechanism is suggested in order to explain the formation of the main reaction products.
